I use an identical product, but under the name String Swing. I’ve hung all sorts from them, including nitro cellulose finishes, never had an issue. If memory serves, the typical hangers in places like Guitar Guitar look like the same finish and they obviously have all sorts of exotica (as well as cheaper instruments) hanging off of them.
https://www.amazon.com/String-Swing-CC01KOAK-Hardwood-Studio/dp/B0002GLCRC